<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
      <input type="text" v-model.lazy="msg">
      <br>
      {{msg}}
      <hr>
      <input type="text" v-model.trim="msg2">
      <br>
      <button>按钮</button>{{msg2}}

      <hr>
      <input type="text" v-model.number="msg3">
      <br>
      {{msg3}}
  </div>

  <script src="./vue.global.js"></script>
  <script>
    const msg2 = '哈哈哈'
    const { createApp } = Vue;
    const app = createApp({
      data(){
        return {
          msg: '初始值',
          msg2: ' 值 ',
          msg3: ''
        }
      }
    });
    app.mount('#app');

    /* 
      如何去除 字符串开头结尾的空格
      const str = '   feefe    ede   ';
      str.trim()
    */
  </script>
</body>
</html>